7167780: Hang javasoft.sqe.tests.api.javax.swing.Timer.Ctor2Tests

Reviewed-by: alexsch

jdk/src/share/classes/javax/swing/TimerQueue.java

@@ -187,6 +187,9 @@ class TimerQueue implements Runnable
                                 addTimer(delayedTimer);
                             }
                         }
+
+                        // Allow run other threads on systems without kernel threads
+                        timer.getLock().newCondition().awaitNanos(1);
                     } catch (SecurityException ignore) {
                     } finally {
                         timer.getLock().unlock();